Yes, I compared the most fuel efficient gas tractor tested to the least efficient diesels - and I made that VERY clear. Somebody earlier claimed that there were NO gas tractors that beat ANY diesels at Nebraska Testing. I posted to show that statement to be incorrect.
I wonder why people who say they like diesels seem to get upset over known facts about them. If a person is a die-hard diesel fan (like I am), seems you ought to be comfortable with the pros and the cons.
The most fuel efficient diesel tested at Nebraska - only up to 1984 - is not the Deere R. #1 is the Japanese Yanmar with a Deere brand-name stuck on it - the 1650 turbo-diesel. Tested at 18.6 HHG. #2 is the Deere 720 diesel. #3 is the MF-150. #4 is the MF-230.
John Deere R diesel took 17th place.
World record holder right now (last I checked) is a New Holland powered tractor. Buhler Versatile 2180 , tested in 1996 with a New Holland 6-banger, 456 c.i. turbo and intercooled. 200 PTO horse at 19.5 HHG.
But, this world-record breaker when hooked to a 5 foot brush hog, uses more fuel than a 1950s Ford gas tractor. It makes 30 horse at 9 HHG.
A 1955 Ford 640 with the 134 gas engine does the same at 11.2 HHG. So, at that low power, it is more efficient then the world-record breaker.
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